| 摘要 |
A cardboard with great rigidity and low grammage, as well as a package made thereof, is described. The cardboard consists of a core, which is surrounded by at least one, preferably 1-3 outer plies, on each side. The cardboard has a grammage of 100-300 g/m2, a bending resistance index of at least 25 Nm6/kg3, preferably of 30-60 Nm6/kg3, and a Scott Bond z-strength of at least 100 J/m2. The core of the cardboard mainly consists of chemi-thermomechanical pulp and has a density of 200-450 kg/m3 and the core constitutes 55-80 % of the total grammage of the cardboard. The outer plies have a tensile stiffness index of 7.0-9.5 kgNm/g and mainly consist of chemical pulp.
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